PCDD/Fs removal efficiency by electrostatic precipitator and wetfine scrubber in an iron ore sintering plant

Guerriero, Ettore; Guarnieri, Alessandra; Mosca, Silvia; Rossetti, Gianluca; Rotatori, Mauro

doi:10.1016/j.jhazmat.2009.08.019

Cited by 41 publications

(16 citation statements)

References 26 publications

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“…The correlation coefficients were then improved to 0.606 for mass and 0.450 for I-TEQ, with the congener profiles of both short-term methods consistent and similar to those of the LA samples and previous studies, as shown in Fig. 6(B) (Wang et al, 2003c;Guerriero et al, 2009;Cavaliere et al, 2011;Ooi and Lu, 2011;Chen et al, 2012;Kuo et al, 2012;Esposito et al, 2014). The average PCDD/F mass and TEQ levels collected by short-term AMESA were also reduced to 1.23 (RSD = 8%) and 0.167 (RSD = 4%), which were very close to the SM results.…”

Section: Short-term Amesa (La) and Manual (Sm) Samplingssupporting

confidence: 82%

Utilization and Improvement of the Adsorption Method for Sampling PCDD/Fs from a Sinter Plant

Wang

Lin

Chang-Chien

et al. 2015

Aerosol Air Qual. Res.

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In this work, the Adsorption Method for Sampling (AMESA) is developed to collect long-term samples of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) from stacks. However, the variation of in duration might affect the analytical results due to the memory effect in the AMESA. This research is one of the very few reports of using AMESA in sinter plants. Eight long-term AMESA (LA) samples were collected, followed by 16 parallel short-term AMESA (SA) and manual (SM) samples. The LA reports good correlations (R = 0.82-0.83) between PCDD/F emissions and the recovery feedstock, which can be further used for emission reduction. However, the breakthrough effects of the highly chlorinated PCDD/Fs is in the range of 6-14% in LA samples, and these are further improved by increasing the glass wool and adsorbent (with higher specific surface area, lower pore size, and higher polarity) packing, and finally reduced to 5.17%. For the shortterm sampling, a maximum difference of 170% occurred between SA and SM, if the sampling strategy suddenly changed from LA to SA. The PCDD/F memory effect remained for the first 8 SA samples, with the dominant 1,2,3,4,6,7,8-HpCDD and OCDD. Therefore, five post-washings for the AMESA system took place to successfully reduce the PCDD/F residual mass to > 0.2% of a normal LA. Unfortunately, these residuals were still equal to 51.4% of a normal SA. Therefore, it is not suggested that AMESA replace the current manual sampling method without any modification. According to this study, both the breakthrough and memory effects could be inhibited. Finally, a new inspection system, including both AMESA and shortterm samples, is then proposed for improving the PCDD/F control strategy in Taiwan.

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Section: Short-term Amesa (La) and Manual (Sm) Samplingssupporting

confidence: 82%

Utilization and Improvement of the Adsorption Method for Sampling PCDD/Fs from a Sinter Plant

Wang

Lin

Chang-Chien

et al. 2015

Aerosol Air Qual. Res.

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“…PBDD/F concentrations in fly ash samples from a plant’s fourth ESP were collected where available. The de novo synthesis can occur when the stack gas temperature is 300 °C . In the plant investigated here, the ESP operating temperature was commonly below 200 °C.…”

Section: Resultsmentioning

confidence: 99%

Effects of Desulfurization Processes on Polybrominated Dibenzo-p-dioxin and Dibenzofuran Emissions from Iron Ore Sintering

Wang

Liu

2018

Environ. Sci. Technol.

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Installing desulfurization operations and closing outdated facilities can effectively decrease pollutant emissions from iron ore sintering plants (IOSPs). Polybrominated dibenzo- p-dioxin and dibenzofuran (PBDD/F) emissions from different-sized IOSPs with different desulfurization operations were analyzed. The desulfurization operations' PBDD/F removal efficiencies were 53.6%-97.1%, and were higher for wet desulfurization operations than for semidry and dry operations. The removed PBDD/Fs were transferred to the desulfurization products. The removal efficiencies of PBDF homologues increased with the degree of bromination. A PBDD/F emission inventory for Chinese IOSPs was compiled. PBDD/F emissions in stack gases, desulfurization products, and discarded fly ash (previously ignored) from 2003 to 2015 were 1218, 400, and 245 g toxic equivalents, respectively. PBDD/F concentrations in stack gases and fly ash were higher for small IOSPs (<90 m), indicating the importance of phasing them out. Indeed, in China, such phasing out decreased PBDD/F emissions in stack gases, desulfurization products, and discarded fly ash by 1021, 891, and 3253 g toxic equivalents, respectively, between 2003 and 2015. PBDD/F emissions in stack gases have been controlled in Chinese regions with the highest emissions, but PBDD/F emissions in desulfurization products and fly ash are increasing.

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“…This is not surprising as there is no such coarse material in the fabric filter dust. The lower concentration of chlorides in the coarsest fraction compared to the EP dust can be explained by the fact that the chlorides in the EP dust are enriched in the smaller particles (Gebert 1996).…”

Section: Chemical Composition Of the Original Residues And The Fractimentioning

confidence: 99%

“…Therefore, in the last two decades, a second-stage off-gas cleaning system was installed at several sinter plants. This additional cleaning stage can be a wet system or a dry system (Menad et al 2006;Delwig et al 2007;Guerriero et al 2009). However, dry systems using a sorption process for the separation of acid gases, and a fabric filter for final dedusting, are predominantly used (Weiss 1998;Leroy et al 2007;Lanzerstorfer et al 2008;Yu et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Residues from single-stage dry de-dusting and desulphurization of sinter plant off-gas: enabling partial recirculation by air classification

Lanzerstorfer

Neuhold

2014

Int. J. Environ. Sci. Technol.

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In iron ore sinter plants, the process off-gas is de-dusted by electrostatic precipitators which are installed upstream of the fan. For further reduction of emissions, a second cleaning stage can be installed. This stage usually comprises a sorption process for removal of acid gases and polychlorinated dibenzo(p)dioxins and furans, followed by a fabric filter. The residue from the first de-dusting stage can be recirculated to the sintering process. The residue from the second cleaning stage has to be disposed of in landfill sites. A new single-stage off-gas cleaning concept for sinter plants comprises an entrained flow sorption process and a fabric filter, installed upstream of the fan. In this way, the investment costs for the off-gas cleaning system can be reduced significantly. However, it would become necessary to dispose of most of the residue. In this work, air classification of a residue equivalent to that of a single-stage off-gas cleaning unit was investigated with the aim of producing a fraction of this residue with reduced sulphur and chloride concentrations which can then be recycled. The results confirm that air classification is a suitable process. In order to maintain raw mixture targets for chlorine or to avoid chlorine enrichment in the raw feed, the recommended dust recycling rate is 66 % with air classification which is an improvement over the allowed rates without air classification of 42 %.

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PCDD/Fs removal efficiency by electrostatic precipitator and wetfine scrubber in an iron ore sintering plant

Cited by 41 publications

References 26 publications

Utilization and Improvement of the Adsorption Method for Sampling PCDD/Fs from a Sinter Plant

Utilization and Improvement of the Adsorption Method for Sampling PCDD/Fs from a Sinter Plant

Effects of Desulfurization Processes on Polybrominated Dibenzo-p-dioxin and Dibenzofuran Emissions from Iron Ore Sintering

Residues from single-stage dry de-dusting and desulphurization of sinter plant off-gas: enabling partial recirculation by air classification

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